US8606936B2 - Communication system, session control management server and session control method - Google Patents

Communication system, session control management server and session control method Download PDF

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US8606936B2
US8606936B2 US12/792,100 US79210010A US8606936B2 US 8606936 B2 US8606936 B2 US 8606936B2 US 79210010 A US79210010 A US 79210010A US 8606936 B2 US8606936 B2 US 8606936B2
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address
session control
temporary
terminal
called
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US20100312903A1 (en
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Hiroaki Miyata
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Hitachi Ltd
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Hitachi Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
    • H04L63/0407—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the identity of one or more communicating identities is hidden
    • H04L63/0421—Anonymous communication, i.e. the party's identifiers are hidden from the other party or parties, e.g. using an anonymizer

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  • the present invention relates to a communication system, a session control management server and a session control method, and more particularly to a communication system, a session control management server and a session control method for performing a response process in the case of receiving an anonymous call incoming request, with the session control in the internet.
  • an IP telephone service using the internet is provided by each carrier and an Internet Service Provider (ISP). Also, in the IP telephone service, a Voice over IP (VoIP) communication for transferring voice data with an Real Time Transport Protocol (RTP) packet is performed by establishing a channel (session) between the terminals before starting the communication.
  • VoIP Voice over IP
  • RTP Real Time Transport Protocol
  • an Session Initiation Protocol is specified for controlling the session between the terminals via an SIP server.
  • An SIP message is composed of a start line part and a header part for carrying the request or response information and a message body part for describing the session content, in which an Session Description Protocol (SDP), for example, is employed to describe the session content, and the other party of communication is identified by a request Uniform Resource Identifier (URI) described in the start line part.
  • SDP Session Description Protocol
  • URI Uniform Resource Identifier
  • the session establishment between the terminals is basically made, employing the URI information such as the telephone numbers of the calling party and the called party, but since it has a calling party number anonymous service (hereinafter referred to as anonymous) in the same way as a telephone exchange service, the called party receiving an anonymous call can confirm the calling party by speech.
  • anonymous calling party number anonymous service
  • the IP telephone service unlike the telephone exchange service, is specified to notify an IP address and so on for use in the RTP packet communication in establishing the session with an SIP message, so that the IP address of the called party is unconditionally notified to the calling party. Therefore, there is a problem that the IP address of the called party is known before confirming the calling party by speech.
  • DOS Denial of Service
  • an object of this invention is to provide a communication system, a session control management server and a session control method for implementing a calling party number anonymous service in the IP telephone service.
  • an IP telephone network in which a plurality of IP telephone terminals having a function of making the communication employing a temporary IP address in receiving an anonymous call incoming request message, for example, are connected to an SIP server for assigning the temporary IP address from a Pool IP address, and adding the assigned temporary IP address to an INVITE message to be transferred in receiving an anonymous call incoming request INVITE message directed to an IP telephone terminal receiving a temporary IP address request message
  • the IP telephone terminal adds the setting of requesting the Pool IP address along with the normal IP address to a Contact field of a REGISTER message in registering the information with the SIP server, and requests the assignment of the temporary IP address if receiving the anonymous call incoming request message.
  • the SIP server upon detecting the request setting in the REGISTER message, can register the information regarding the normal IP address and the information for assigning the Pool IP address at the anonymous call incoming request in a subscriber management table.
  • the SIP server makes the temporary assignment of the Pool IP address and notifies the temporary IP address to the called party IP telephone terminal by adding it to a From field of the INVITE message, if the called party IP telephone terminal for the anonymous call incoming request INVITE message is the IP telephone terminal.
  • the called party IP telephone terminal receiving the assignment of the temporary IP address can make the connection, communication and disconnection processes employing the temporary IP address for the self IP address in the following dialog.
  • the called party IP telephone terminal that communicates with a calling party IP telephone terminal for the anonymous call incoming request can make the communication without the self IP address known to the anonymous party.
  • the session control protocol is not the SIP, but the session control protocol such as an MGCP, H.248 may be employed in the same way as the SIP.
  • a communication system in which a plurality of IP terminals are connected to a session control management server, the session control management server comprising:
  • connection management table storing a status indicating talking or disconnected, calling party information and called party information
  • a subscriber management table storing a telephone number, an identifier and an IP address for each subscriber
  • the session control management server extracts the calling party information and the called party information from a first connection request message received from an IP terminal, and registers a calling party address as the calling party information and a called terminal identifier as the called party information in the connection management table;
  • the session control management server sends a second connection request message including the called terminal identifier and a temporary IP address assigned to a called IP terminal in the called party information to the called IP terminal;
  • the called IP terminal extracts the called party information from the received second connection request message and sends a response message using the temporary IP address as a self IP address to the session control management server if the temporary IP address is included;
  • the session control management server makes the communication between a calling IP terminal and the called IP terminal under the session connection establishment control by referring to the connection management table with the temporary IP address.
  • a session control management server in a communication system in which a plurality of IP terminals are connected to the session control management server, the session control management server comprising:
  • connection management table storing a status indicating talking or disconnected, calling party information and called party information
  • a subscriber management table storing a telephone number, an identifier and an IP address for each subscriber
  • the session control management server extracts the calling party information and the called party information from a first connection request message received from an IP terminal, and registers a calling party address as the calling party information and a called terminal identifier as the called party information in the connection management table;
  • the session control management server sends a second connection request message including the called terminal identifier and a temporary IP address assigned to a called IP terminal in the called party information to the called IP terminal;
  • the session control management server receives a response message employing the temporary IP address as the self IP address from the called IP terminal, and
  • the session control management server makes a communication between the calling IP terminal and the called IP terminal under the session connection establishment control by referring to the connection management table with the temporary IP address.
  • connection management table storing a status indicating talking or disconnected, calling party information and called party information
  • a subscriber management table storing a telephone number, an identifier and an IP address for each subscriber
  • the session control management server extracts the calling party information and the called party information from a first connection request message received from an IP terminal, and registers a calling party address as the calling party information and a called terminal identifier as the called party information in the connection management table;
  • the session control management server sends a second connection request message including the called terminal identifier and a temporary IP address assigned to a called IP terminal in the called party information to the called IP terminal;
  • the called IP terminal extracts the called party information from the received second connection request message and sends a response message using the temporary IP address as a self IP address to the session control management server if the temporary IP address is included;
  • the session control management server makes the communication between a calling IP terminal and the called IP terminal under the session connection establishment control by referring to the connection management table with the temporary IP address.
  • a communication system and a session control method for implementing a calling party number anonymous service in the IP telephone service can be provided.
  • this invention it is possible to increase the security of the receiver side by notifying the temporary address as the IP address of the receiver under the session control.
  • FIG. 1 is a diagram showing an IP telephone network configuration example.
  • FIG. 2 is a block diagram showing the configuration of a main part of an IP telephone terminal.
  • FIG. 3 is a block diagram showing the configuration of a main part of an SIP server.
  • FIGS. 4A and 4B are views showing the organization of a subscriber management table.
  • FIGS. 5A , 5 B and 5 C are views showing the organization of a connection management table.
  • FIGS. 6A and 6B are views showing the organization of a Pool address management table.
  • FIG. 7 is a chart showing a sequence example for registering the IP telephone terminal information with the SIP server.
  • FIG. 8 is a view showing a description example of a REGISTER message (including a request example at the time of Anonymous).
  • FIG. 9 is a chart showing a connection, speech and disconnection sequence example between the IP telephone terminals.
  • FIG. 10 is a view showing a description example of an INVITE message (at the time of calling party Anonymous) from the calling party IP telephone terminal.
  • FIG. 11 is a view showing a description example of an INVITE message (at the time of calling party Anonymous and Pool IP address assignment) from the SIP server.
  • FIG. 13 is a flowchart showing a registration process flow at the IP telephone terminal.
  • FIG. 14 is a flowchart showing a REGISTER process flow in the SIP server.
  • FIG. 15 is a flowchart showing an INVITE process flow in the SIP server.
  • FIG. 16 is a flowchart showing an INVITE receiving process flow at the IP telephone terminal.
  • FIG. 17 is a flowchart showing a connection registration process flow in the SIP server.
  • FIG. 18 is a flowchart showing a disconnection registration process flow in the SIP server.
  • the security on the receiver side can be increased by notifying a temporary address as the IP address of a receiver to the calling party under the session control as will be described in the following. An embodiment will be described below in detail with reference to the drawings.
  • FIG. 1 is a diagram showing a configuration example of an IP telephone network using an SIP as the session control protocol.
  • the network comprises a plurality of IP telephone terminals 1 ( 1 - 1 A to 1 - 1 n , 1 - 2 A to 1 - 2 m ), an SIP server 2 , an L2SW 3 ( 3 - 1 , 3 - 2 ) for connecting each IP telephone terminal 1 to the routers (R) 4 ( 4 - 1 to 4 - 3 ) and the DHCP servers 5 ( 5 - 1 , 5 - 2 ) for dynamically assigning the IP address.
  • an IP telephone terminal 1 registers with the SIP server 2 .
  • the connection control to communicate with the other party of communication is made via the SIP server 2 with an SIP message, and after the completion of session connection, the communication is made between the IP telephone terminals 1 .
  • FIG. 2 is a block diagram showing the configuration of a main part of the IP telephone terminal 1 .
  • the IP telephone terminal 1 mainly comprises a line IF (interface) 11 , a processor 12 , an SIP processing section 13 , a protocol processing section 14 , a speaker 15 of user interface, a microphone 16 and a key 17 .
  • the SIP processing section 13 mainly performs a registration process (F 1 ), an INVITE receiving process (F 102 ) and a connection/disconnection process 131 in accordance with the information inputted by the key 17 .
  • the protocol processing section 14 performs a decode process for an RTP packet received from the line IF 11 .
  • the decoded voice is outputted from the speaker 15 . Also, it performs an encode process for the voice inputted from the microphone 16 , and sends an RTP packet from the line IF 11 .
  • FIG. 3 is a block diagram showing the configuration of a main part of the SIP server 2 .
  • the SIP server 2 mainly comprises a line IF 21 , a processor 22 , an SIP processing section 23 , a connection management table 24 , a subscriber management table 25 and a Pool address management table 26 .
  • the SIP processing section 23 mainly performs a REGISTER process (F 2 ), an INVITE process (F 101 ), a connection registration process (F 103 ) and a disconnection registration process (F 104 ).
  • FIGS. 4A and 4B are views showing the table organization of the subscriber management table 25 for managing each subscriber information registered with the SIP server 2 through the REGISTER process (F 2 ).
  • the subscriber management table 25 includes a subscriber telephone number 251 , an SIP URI 252 , an IP address 253 and an option 254 .
  • FIGS. 5A , 5 B and 5 C are views showing the table organization of the connection management table 24 for management on the SIP server 2 through each of the INVITE process (F 101 ), the connection registration process (F 103 ) and the disconnection registration process (F 104 ) under the session control.
  • the connection management table 24 includes a connection start time 241 , a disconnection time 242 , a status 243 , the calling party information 244 , the called party information 245 and the remarks 246 .
  • FIGS. 6A and 6B are views showing the table organization of the Pool address management table 26 .
  • the Pool address management table 26 includes an IP address 261 , a start time 262 and a user 263 .
  • each table has a reference number (#).
  • a session control processing operation via the SIP server 2 to communicate between user- 1 @A( 1 - 1 A) and user- 2 @B( 1 - 2 B) according to the embodiment 1 will be described below with reference to the sequence charts of FIGS. 7 and 9 , the SIP message views of FIGS. 10 to 12 and the flowcharts of FIGS. 13 to 18 .
  • FIG. 7 is a chart showing a sequence example for registering the IP telephone terminal information with the SIP server.
  • FIG. 13 is a flowchart showing a registration process flow at the IP telephone terminal.
  • the SIP processing section 13 performs the registration process (F 1 ) for the SIP server 2 to enable the communication, when the power of the user- 2 @B ( 1 - 2 B) is turned on, as shown in the sequence chart of FIG. 7 .
  • a determination is made (F 11 ) whether a Pool IP address is requested or not if there is an anonymous call incoming request. If the Pool IP address is not requested (N), a REGISTER message is sent (F 13 ) with the basic information set in the REGISTER message.
  • a Pool IP address request is additionally set in a Contact field of the REGISTER message (F 12 ) to request the assignment of the pool IP address from the SIP serve 2 at the time of anonymous call incoming and the REGISTER message is sent (F 13 ).
  • FIG. 8 is a view showing a description example of the REGISTER message (including a request example at the time of Anonymous).
  • REGISTER (Anonymous: Pool (SQ 1 )) with the setting of Contact: ⁇ sip:user- 2 @anonymous-pool> (M 11 ) added through the registration process (F 1 ) for the REGISTER message (M 1 ) as shown in FIG. 8 is transferred from the user- 2 @B ( 1 - 2 B) to the SIP server 2 .
  • FIG. 14 is a flowchart showing a REGISTER process flow in the SIP server.
  • the SIP processing section 23 performs the REGISTER process (F 2 ).
  • the REGISTER process (F 2 ) as shown in FIG. 14 , a determination is made (F 21 ) whether or not there is a Pool IP address request in the Contact field of the received REGISTER message (M 1 ).
  • the SIP processing section 23 registers only the #s( 255 ), without registering the #t( 256 ), and sends the 200 OK message (F 23 ).
  • the OK message is transferred as the 200 OK (SQ 2 ) message from the SIP server 2 to the user- 2 @B( 1 - 2 B).
  • FIG. 9 is a chart showing a connection, speech and disconnection sequence example between the IP telephone terminals.
  • FIG. 10 is a view showing a description example of an INVITE message (at the time of calling party Anonymous) from the calling party IP telephone terminal.
  • the user- 1 @A( 1 - 2 A) transfers the INVITE message (M 101 ) as shown in FIG. 10 to the SIP server 2 with the INVITE (Anonymous) (SQ 101 ).
  • the SIP processing section 23 performs an INVITE process (F 101 ).
  • FIG. 15 is a flowchart showing an INVITE process flow in the SIP server.
  • 03-5000-2222 and user- 2 @B are set as the information from the To field value “03-5000-2222 ⁇ sip:user- 2 @B>” (M 1012 ) in the header part, for example, (F 1011 ).
  • the SIP processing section 23 determines (F 1013 ) whether or not there is the unknown (anonymous) connection request in the calling party information by referring to the connection management table ( 24 ), or from the INVITE message (M 101 ). If there is no unknown (anonymous) connection request (N), the SIP processing section 23 sends the INVITE message (F 1018 ).
  • the SIP processing section 23 sends the INVITE message to the user- 2 @B (F 1018 ).
  • the SIP processing section 23 adds the Pool address to the INVITE message to notify the assigned Pool address to the user- 2 @B( 1 - 2 B) (F 1017 ).
  • FIG. 11 is a view showing a description example of the INVITE message (at the time of calling party Anonymous and Pool IP address assignment) from the SIP server.
  • the SIP processing section 23 sends the INVITE message to the user- 2 @B (F 1018 ).
  • the INVITE message is transferred as the INVITE (SQ 102 ) from the SIP server 2 to the user- 2 @B( 1 - 2 B).
  • FIG. 16 is a flowchart showing an INVITE receiving process flow at the IP telephone terminal.
  • the SIP processing section 13 performs the INVITE receiving process (F 102 ).
  • the INVITE receiving process (F 102 ) as shown in FIG. 16 , the To field value in the received INVITE message (M 102 ) is extracted (F 1021 ), and a determination is made whether or not the Pool IP address is assigned (F 1022 ).
  • the user- 2 @B( 1 - 2 B) employs the Pool IP address (11.0.0.202) assigned in the SIP server 2 , instead of the formal IP address (11.0.0.2), as the self IP address for use in the SIP message in this dialog and the RTP packet (F 1023 ). Thereafter, the SIP processing section 13 sends the 180 Ringing message to the SIP server 2 (F 1024 ).
  • step F 1022 the SIP processing section 13 sends the 180 Ringing message
  • the user- 2 @B( 1 - 2 B) employs the formal IP address (11.0.0.2) as the self IP address for use in the SIP message in this dialog and the RTP packet (F 1024 ).
  • the SIP processing section 13 sends the 180 Ringing (SQ 103 ) from the user- 2 @B( 1 - 2 B) to the SIP server 2 .
  • the user- 2 @B( 1 - 2 B) sets the Pool IP address as ⁇ sip:user- 2 @11.0.0.202> (M 1031 ) to the Contact field in the 180 Ringing (M 103 ) as shown in FIG. 12 , with the 180 Ringing (SQ 103 ) through the INVITE receiving process (F 102 ).
  • the SIP server 2 receives the 180 Ringing (SQ 103 ) from the user- 2 @B( 1 - 2 B), and transfers the 180 Ringing to the user- 1 @A( 1 - 1 A) (SQ 104 ).
  • the user- 2 @B( 1 - 2 B) transiting to an off-hook state sends the 200 OK (SQ 105 ) from the user- 2 @B ( 1 - 2 B) to the SIP server 2 , which then transfers it to the user- 1 @A( 1 - 1 A) (SQ 106 ).
  • the user- 1 @A( 1 - 1 A) receiving the 200 OK (SQ 106 ) sends it as an ACK (SQ 107 ) to the SIP server 2 from the user- 1 @A( 1 - 1 A).
  • FIG. 17 is a flowchart showing a connection registration process flow in the SIP server.
  • the SIP processing section 23 performs a connection registration process (F 103 ).
  • the connection registration process (F 103 ) as shown in FIG. 17 , the ACK message is received (F 1031 ), the connection start time ( 241 ) is updated to 2009/1/10 11:58:29, and the status ( 243 ) is changed to the talking (F 1032 ), as indicated at #2 in FIG. 5B .
  • the SIP processing section 23 sends the ACK message (F 1033 ).
  • the SIP processing section 23 transfers the ACK (SQ 108 ) from the SIP server 2 to the user- 2 @B( 1 - 2 B).
  • the RTP (VoIP) communication (SQ 109 ) is performed between user- 1 @A( 1 - 1 A) and user- 2 @B( 1 - 2 B) under the session connection establishment control from the INVITE (SQ 101 ) to the ACK (SQ 108 ).
  • BYE(SQ 110 ) is transmitted to the SIP server 2 , and transferred from the SIP server 2 to the user- 2 @B ( 1 - 23 ) (SQ 111 ).
  • the user- 2 @B( 1 - 2 B) receiving the BYE(SQ 111 ) sends the 200 OK (SQ 112 ) to the SIP server 2 .
  • FIG. 18 is a flowchart showing a disconnection registration process flow in the SIP server.
  • the SIP processing section 23 performs a disconnection registration process (F 104 ).
  • the disconnection registration process (F 104 ) as shown in FIG. 18 , the 200 OK message for the BYE message is received (F 1041 ), and the disconnection time ( 242 ) is updated to 2009/1/10 12:4:12 and the status ( 243 ) is changed to disconnect (F 1042 ), as indicated at #2 in FIG. 5C . Thereafter, the 200 OK message is sent (F 1043 ).
  • the SIP processing section 23 transfers the 200 OK message (SQ 113 ) from the SIP server 2 to the user- 1 @A( 1 - 1 A).
  • the SIP is used as the session control protocol and the Pool IP address is used for the called party IP address in the anonymous call incoming request (Anonymous), the session control protocol such as an MGCP, H.248 may be also used in the same way as the SIP.
  • the called party IP telephone terminal may request the DHCP server for the temporary IP address, if it recognizes the anonymous call incoming request (Anonymous).

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Hardware Design (AREA)
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  • General Engineering & Computer Science (AREA)
  • Telephonic Communication Services (AREA)
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JP2009133709A JP5275908B2 (ja) 2009-06-03 2009-06-03 通信システム、セッション制御管理サーバ及びセッション制御方法

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